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href="/categories/Web-APIs%E7%AC%94%E8%AE%B0/">Web APIs笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="Web APIs第七天"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="Web-APIs第七天-正则表达式"><a href="#Web-APIs第七天-正则表达式" class="headerlink" title="Web APIs第七天-正则表达式"></a>Web APIs第七天-正则表达式</h3><h2 id="1-正则表达式"><a href="#1-正则表达式" class="headerlink" title="1. 正则表达式"></a>1. 正则表达式</h2><ol><li>正则表达式（Regular Expression）是用于匹配字符串中字符组合的模式。在 JavaScript中，正则表达式也是对象</li><li>通常用来查找、替换那些符合正则表达式的文本，许多语言都支持正则表达式</li></ol><blockquote><p>正则表达式在 JavaScript中的使用场景：</p></blockquote><ol><li>例如验证表单：用户名表单只能输入英文字母、数字或者下划线， 昵称输入框中可以输入中文(匹配)</li><li>比如用户名: &#x2F;^[a-z0-9_-]{3,16}$&#x2F;</li><li>过滤掉页面内容中的一些敏感词(替换)，或从字符串中获取我们想要的特定部分(提取)等</li><li>正则表达式是用于匹配字符串中字符组合的模式</li><li>.正则表达式作用: 表单验证(匹配),、过滤敏感词(替换)、字符串中提取我们想要的部分(提取)</li></ol><h2 id="2-定义正则表达式语法"><a href="#2-定义正则表达式语法" class="headerlink" title="2. 定义正则表达式语法:"></a>2. 定义正则表达式语法:</h2><ol><li>定义规则</li><li>查找</li></ol><blockquote><p>JavaScript 中定义正则表达式的语法有两种，我们先学习其中比较简单的方法：</p></blockquote><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">其中 / /是正则表达式字面量</span><br><span class="line"><span class="comment">// 1. 定义规则/正则表达式 存的是对象</span></span><br><span class="line"><span class="keyword">let</span> reg = <span class="regexp">/前端/</span></span><br></pre></td></tr></table></figure><h2 id="3-判断是否有符合规则的字符串"><a href="#3-判断是否有符合规则的字符串" class="headerlink" title="3. 判断是否有符合规则的字符串"></a>3. 判断是否有符合规则的字符串</h2><h3 id="1-test-方法-用来查看正则表达式与指定的字符串是否匹配"><a href="#1-test-方法-用来查看正则表达式与指定的字符串是否匹配" class="headerlink" title="1. test() 方法 用来查看正则表达式与指定的字符串是否匹配"></a>1. test() 方法 用来查看正则表达式与指定的字符串是否匹配</h3><ol><li>定义正则表达式, 检测查找是否匹配</li><li>如果正则表达式与指定的字符串匹配 ，返回true，否则false</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 查找 检测是否匹配 返回true/false 重点</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="string">&#x27;努力学前端&#x27;</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(reg.<span class="title function_">test</span>(num1))</span><br></pre></td></tr></table></figure><h3 id="2-检索（查找）符合规则的字符串："><a href="#2-检索（查找）符合规则的字符串：" class="headerlink" title="2. 检索（查找）符合规则的字符串："></a>2. 检索（查找）符合规则的字符串：</h3><ol><li>exec() 方法 在一个指定字符串中执行一个搜索匹配</li><li>如果匹配成功，exec() 方法返回一个数组，否则返回null</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 检索/查找 符合规则的字符串 返回的数组</span></span><br><span class="line"><span class="keyword">let</span> num2 = reg.<span class="title function_">exec</span>(num1)</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(num2)</span><br></pre></td></tr></table></figure><blockquote><p>正则表达式检测查找 test方法和exec方法的区别</p></blockquote><ol><li>test方法 用于判断是否有符合规则的字符串，返回的是布尔值 找到返回 true，否则false</li><li>exec方法用于检索（查找）符合规则的字符串，找到返回数组，否则为 null</li></ol><h2 id="4-元字符"><a href="#4-元字符" class="headerlink" title="4. 元字符"></a>4. 元字符</h2><ol><li>是一些具有特殊含义的字符，可以极大提高了灵活性和强大的匹配功能, 比如，规定用户只能输入英文26个英文字母，普通字符的话 abcdefghijklm….., 但是换成元字符写法： [a-z]</li><li>MDN文档: <a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions">https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions</a></li><li>正则测试工具: <a target="_blank" rel="noopener" href="http://tool.oschina.net/regex">http://tool.oschina.net/regex</a></li></ol><h3 id="1-边界符"><a href="#1-边界符" class="headerlink" title="1. 边界符"></a>1. 边界符</h3><ol><li><p>正则表达式中的边界符（位置符）用来提示字符所处的位置，主要有两个字符</p></li><li><p>如果 ^ 和 $ 在一起，表示必须是精确匹配</p></li></ol><table><thead><tr><th>边界符</th><th>说明</th></tr></thead><tbody><tr><td>^</td><td>匹配行首的文本**(以谁开始)**</td></tr><tr><td>$</td><td>匹配行尾的文本**(以谁结束)**</td></tr></tbody></table><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. ^开头</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^哈哈/</span>.<span class="title function_">test</span>(<span class="string">&#x27;都哈哈&#x27;</span>)) <span class="comment">// false</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^哈哈/</span>.<span class="title function_">test</span>(<span class="string">&#x27;哈哈大笑&#x27;</span>)) <span class="comment">// true</span></span><br><span class="line"><span class="comment">// 2. $ 结尾 精确匹配</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^哈哈$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;哈哈你们&#x27;</span>)) <span class="comment">// false</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^哈哈$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;哈哈&#x27;</span>)) <span class="comment">// true</span></span><br></pre></td></tr></table></figure><h3 id="2-量词"><a href="#2-量词" class="headerlink" title="2. 量词"></a>2. 量词</h3><ol><li>量词用来 设定某个模式出现的次数</li><li>注意： 逗号左右两侧千万不要出现空格</li></ol><table><thead><tr><th align="left">量词</th><th align="left">说明</th></tr></thead><tbody><tr><td align="left">*</td><td align="left">重复0次到N次 n &gt;&#x3D; 0</td></tr><tr><td align="left">+</td><td align="left">只重复1次到N次 n &gt;&#x3D; 1</td></tr><tr><td align="left">?</td><td align="left">只重复0次或1次</td></tr><tr><td align="left">{n}</td><td align="left">只能出现n次</td></tr><tr><td align="left">{n,}</td><td align="left">出现n次或更多次 &gt;&#x3D; n</td></tr><tr><td align="left">{n,m}</td><td align="left">大于N次 小于M次 &gt;&#x3D; n &lt;&#x3D; m 注意不能空格</td></tr></tbody></table><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. * 重复0次到N次 n &gt;= 0</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a*/</span>.<span class="title function_">test</span>(<span class="string">&#x27;&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a*/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a*/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a*/</span>.<span class="title function_">test</span>(<span class="string">&#x27;b&#x27;</span>))</span><br><span class="line"><span class="comment">// 2. + 只重复1次到N次 n &gt;= 1</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a+/</span>.<span class="title function_">test</span>(<span class="string">&#x27;&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a+/</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a+/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a+/</span>.<span class="title function_">test</span>(<span class="string">&#x27;b&#x27;</span>))</span><br><span class="line"><span class="comment">// 3. ? 只重复0次或1次</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a?$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a?$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a?$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;----------&#x27;</span>)</span><br><span class="line"><span class="comment">// 4. &#123;3&#125; 只能出现n次</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaa&#x27;</span>))</span><br><span class="line"><span class="comment">// 5. &#123;3, &#125; 出现n次或更多次 &gt;= n</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaa&#x27;</span>))</span><br><span class="line"><span class="comment">// 6. &#123;3,6&#125; 大于N次 小于M次 &gt;= n &lt;= m 注意不能空格</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,6&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,6&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,6&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaa&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^a&#123;3,6&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aaaaaaa&#x27;</span>))</span><br></pre></td></tr></table></figure><h3 id="3-字符类"><a href="#3-字符类" class="headerlink" title="3.字符类"></a>3.字符类</h3><ol><li><input disabled type="checkbox"> 匹配字符集合, 后面的字符串只要包含 abc 中任意一个字符，都返回 true</li><li><input disabled type="checkbox"> 里面加上 - 连字符, 使用连字符 - 表示一个范围</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 只要包含abc任意一个 都是true</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[abc]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[abc]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;ab&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[abc]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;admin&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[abc]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;csy&#x27;</span>))</span><br><span class="line"><span class="comment">// 2. 连字符 只能选取一个</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[abc]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;abc&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[abc]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[abc]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;b&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[abc]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;c&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[abc]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;aa&#x27;</span>))</span><br><span class="line"><span class="comment">// 3. 26个字母选取任意一个</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;d&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;e&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;f&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;F&#x27;</span>))</span><br><span class="line"><span class="comment">// 4. 26个字符 包含大小写</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-zA-Z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;Z&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-zA-Z]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;D&#x27;</span>))</span><br><span class="line"><span class="comment">// 5. 26个字母 包含大小写和数字</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-zA-Z0-9]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;8&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-zA-Z0-9]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;9&#x27;</span>))</span><br><span class="line"><span class="comment">// 6. 只能字母数字下划线</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[a-zA-Z0-9-_]$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;1&#x27;</span>))</span><br><span class="line"><span class="comment">// 7. &#123;4,&#125; 只对前面一个生效</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^[1-9][0-9]&#123;4,&#125;$/</span>.<span class="title function_">test</span>(<span class="string">&#x27;10000&#x27;</span>))</span><br><span class="line"><span class="comment">// 8. [^] 取反符号 除了小写字母以外的字符</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[^a-z]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[^a-z]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;A&#x27;</span>))</span><br><span class="line"><span class="comment">// 9. . 匹配换行符之外 任何单个字符</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/[.a]/</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="comment">// 10. 日期格式</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^\d&#123;4&#125;-\d&#123;1,2&#125;-\d&#123;1,2&#125;/</span>.<span class="title function_">test</span>(<span class="string">&#x27;20230102&#x27;</span>))</span><br></pre></td></tr></table></figure><h3 id="4-用户名验证案例"><a href="#4-用户名验证案例" class="headerlink" title="4. 用户名验证案例"></a>4. 用户名验证案例</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 用户名要求用户英文字母,数字,下划线或者短横线组成，并且用户名长度为 6~16位</span></span><br><span class="line">&lt;input type=<span class="string">&quot;text&quot;</span>&gt;</span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">span</span>&gt;</span><span class="tag">&lt;/<span class="name">span</span>&gt;</span></span></span><br><span class="line"><span class="keyword">let</span> n1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;input&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> n2 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;span&#x27;</span>)</span><br><span class="line">n1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;blur&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (<span class="regexp">/^[a-zA-Z0-9]&#123;6,16&#125;$/</span>.<span class="title function_">test</span>(n1.<span class="property">value</span>)) &#123;</span><br><span class="line">        n2.<span class="property">className</span> = <span class="string">&#x27;right&#x27;</span></span><br><span class="line">        n2.<span class="property">innerHTML</span> = <span class="string">`输入正确`</span></span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        n2.<span class="property">className</span> = <span class="string">&#x27;error&#x27;</span></span><br><span class="line">        n2.<span class="property">innerHTML</span> = <span class="string">&#x27;请输入6~16的字符&#x27;</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><h3 id="5-字符类预定类"><a href="#5-字符类预定类" class="headerlink" title="5. 字符类预定类:"></a>5. 字符类预定类:</h3><p>预定义: 指的是某些常见模式的简写方式</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 日期格式</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/^\d&#123;4&#125;-\d&#123;1,2&#125;-\d&#123;1,2&#125;/</span>.<span class="title function_">test</span>(<span class="string">&#x27;20230102&#x27;</span>))</span><br></pre></td></tr></table></figure><table><thead><tr><th align="left">预定类</th><th align="left">说明</th></tr></thead><tbody><tr><td align="left">\d</td><td align="left">匹配0~9之间的任一数字, 相当于[0-9]</td></tr><tr><td align="left">\D</td><td align="left">匹配所有0~9以外的字符, 相当于 ^0-9]</td></tr><tr><td align="left">\w</td><td align="left">匹配任意的字母、数字和下划线, 相当于[a-zA-Z0-9-__]</td></tr><tr><td align="left">\W</td><td align="left">除所有字母、数字下划线以外的字符, 相当于 ^a-zA-Z0-9-__]</td></tr><tr><td align="left">\s</td><td align="left">匹配空格(换行符、制表符、空格符等), 相当于[\t\r\n\v\f]</td></tr><tr><td align="left">\S</td><td align="left">匹配非空格(的字符, 相当于 ^\t\r\n\v\f]</td></tr></tbody></table><h3 id="6-修饰符"><a href="#6-修饰符" class="headerlink" title="6. 修饰符"></a>6. 修饰符</h3><ol><li>修饰符约束正则执行的某些细节行为，如是否区分大小写、是否支持多行匹配等</li><li>i 是单词 ignore 的缩写，正则匹配时字母不区分大小写</li><li>g 是单词 global 的缩写，匹配所有满足正则表达式的结果</li><li>replace 敏感词替换 搭配 g 使用</li></ol><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. i 不区分大小写</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a/i</span>.<span class="title function_">test</span>(<span class="string">&#x27;a&#x27;</span>))</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="regexp">/a/i</span>.<span class="title function_">test</span>(<span class="string">&#x27;A&#x27;</span>))</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2. g 选出所有满足表达式的结果</span></span><br><span class="line"><span class="comment">// 3. replace 敏感词替换 搭配 g 使用  </span></span><br><span class="line">&lt;textarea name=<span class="string">&quot;&quot;</span> cols=<span class="string">&quot;30&quot;</span> rows=<span class="string">&quot;10&quot;</span>&gt;&lt;/textarea&gt;</span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">button</span>&gt;</span>发布<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">div</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span></span><br><span class="line"><span class="language-xml"><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&quot;text&quot;</span>&gt;</span></span></span><br><span class="line"><span class="language-xml">let n1 = document.querySelector(&#x27;textarea&#x27;)</span></span><br><span class="line"><span class="language-xml">let n2 = document.querySelector(&#x27;button&#x27;)</span></span><br><span class="line"><span class="language-xml">let n3 = document.querySelector(&#x27;div&#x27;)</span></span><br><span class="line"><span class="language-xml">n2.addEventListener(&#x27;click&#x27;, function () &#123;</span></span><br><span class="line"><span class="language-xml">    // n3.innerHTML = n1.value</span></span><br><span class="line"><span class="language-xml">    // replace 敏感词替换 搭配 g全局替换 使用 </span></span><br><span class="line"><span class="language-xml">    n3.innerHTML = n1.value.replace(/你好|你哈/g, (&#x27;**&#x27;))</span></span><br><span class="line"><span class="language-xml">&#125;)</span></span><br></pre></td></tr></table></figure><h2 id="5-综合案例"><a href="#5-综合案例" class="headerlink" title="5. 综合案例"></a>5. 综合案例</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. change 事件 当表单发生变化时触发 和blur不一样</span></span><br><span class="line"><span class="keyword">let</span> num1 = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;input&#x27;</span>)</span><br><span class="line"><span class="comment">// 2. input 事件 输入就触发</span></span><br><span class="line"><span class="comment">// 3. change 事件 离开表单才触发 并且值得有变化</span></span><br><span class="line">num1.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">1</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 发送验证码 用户点5秒后重新获取验证码 立即执行函数</span></span><br><span class="line">  (<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">      <span class="keyword">let</span> btnMsg = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.code&#x27;</span>)</span><br><span class="line">    btnMsg.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> num1 = <span class="number">5</span></span><br><span class="line">      <span class="variable language_">this</span>.<span class="property">innerHTML</span> = <span class="string">&#x27;05秒后重新获取&#x27;</span></span><br><span class="line">      <span class="keyword">let</span> time = <span class="built_in">setInterval</span>(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">          num1--</span><br><span class="line">        btnMsg.<span class="property">innerHTML</span> = <span class="string">`0<span class="subst">$&#123;num1&#125;</span>秒后重新获取`</span></span><br><span class="line">        <span class="keyword">if</span> (num1 == <span class="number">0</span>) &#123;</span><br><span class="line">            btnMsg.<span class="property">innerHTML</span> = <span class="string">&#x27;发送验证码&#x27;</span></span><br><span class="line">          <span class="built_in">clearInterval</span>(time)</span><br><span class="line">        &#125;</span><br><span class="line">      &#125;, <span class="number">1000</span>)</span><br><span class="line">    &#125;)</span><br><span class="line"><span class="comment">// 2. 用户名验证 </span></span><br><span class="line">    <span class="keyword">let</span> user = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=username]&#x27;</span>)</span><br><span class="line">    user.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, verify)</span><br><span class="line">    <span class="comment">// *鼠标离开 下一步都需要表单验证 所以封装成函数</span></span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">verify</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> reg = <span class="regexp">/^[a-zA-Z0-9-_]&#123;6,16&#125;$/</span></span><br><span class="line">      <span class="keyword">let</span> span = user.<span class="property">nextElementSibling</span></span><br><span class="line">      <span class="keyword">if</span> (!reg.<span class="title function_">test</span>(user.<span class="property">value</span>)) &#123;</span><br><span class="line">          span.<span class="property">innerHTML</span> = <span class="string">&#x27;请输入6~16的字符&#x27;</span></span><br><span class="line">        <span class="comment">// *如果是false 则返回false/true 为下一步按钮做判断</span></span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">      span.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 3. 手机号验证</span></span><br><span class="line">    <span class="keyword">let</span> phone = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=phone]&#x27;</span>)</span><br><span class="line">    phone.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, verifyphone)</span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">verifyphone</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="comment">// *11位手机号验证 正则表达式</span></span><br><span class="line">        <span class="keyword">let</span> reg = <span class="regexp">/^1(3\d|4[5-9]|5[0-35-9]|6[567]|7[0-8]|8\d|9[0-35-9])\d&#123;8&#125;$/</span></span><br><span class="line">      <span class="keyword">let</span> span = phone.<span class="property">nextElementSibling</span></span><br><span class="line">      <span class="keyword">if</span> (!reg.<span class="title function_">test</span>(phone.<span class="property">value</span>)) &#123;</span><br><span class="line">          span.<span class="property">innerHTML</span> = <span class="string">&#x27;请输入11位的手机号&#x27;</span></span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">      span.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 4. 验证码验证</span></span><br><span class="line">    <span class="keyword">let</span> code = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=code]&#x27;</span>)</span><br><span class="line">    code.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, verifycode)</span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">verifycode</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="comment">// *6位数验证码验证 正则表达式</span></span><br><span class="line">        <span class="keyword">let</span> reg = <span class="regexp">/^\d&#123;6&#125;$/</span></span><br><span class="line">      <span class="keyword">let</span> span = code.<span class="property">nextElementSibling</span></span><br><span class="line">      <span class="keyword">if</span> (!reg.<span class="title function_">test</span>(code.<span class="property">value</span>)) &#123;</span><br><span class="line">          span.<span class="property">innerHTML</span> = <span class="string">&#x27;请输入6位数的验证码&#x27;</span></span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">      span.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 5. 密码验证</span></span><br><span class="line">    <span class="keyword">let</span> password = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=password]&#x27;</span>)</span><br><span class="line">    password.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, verifypassword)</span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">verifypassword</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="comment">// *6~20位密码验证 正则表达式</span></span><br><span class="line">        <span class="keyword">let</span> reg = <span class="regexp">/^[a-zA-Z0-9-_]&#123;6,20&#125;$/</span></span><br><span class="line">      <span class="keyword">let</span> span = password.<span class="property">nextElementSibling</span></span><br><span class="line">      <span class="keyword">if</span> (!reg.<span class="title function_">test</span>(password.<span class="property">value</span>)) &#123;</span><br><span class="line">          span.<span class="property">innerHTML</span> = <span class="string">&#x27;请输入6~20位密码&#x27;</span></span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">      span.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 6. 再次密码验证</span></span><br><span class="line">    <span class="keyword">let</span> pass = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=confirm]&#x27;</span>)</span><br><span class="line">    pass.<span class="title function_">addEventListener</span>(<span class="string">&#x27;change&#x27;</span>, verifypass)</span><br><span class="line">    <span class="keyword">function</span> <span class="title function_">verifypass</span>(<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> span = pass.<span class="property">nextElementSibling</span></span><br><span class="line">        <span class="keyword">if</span> (pass.<span class="property">value</span> !== password.<span class="property">value</span>) &#123;</span><br><span class="line">          span.<span class="property">innerHTML</span> = <span class="string">&#x27;两次密码不一致&#x27;</span></span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">      span.<span class="property">innerHTML</span> = <span class="string">&#x27;&#x27;</span></span><br><span class="line">      <span class="keyword">return</span> <span class="literal">true</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">// 7. 同意按钮样式切换 queren2选中样式</span></span><br><span class="line">    <span class="keyword">let</span> btnIocn = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.icon-queren&#x27;</span>)</span><br><span class="line">    btnIocn.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="variable language_">this</span>.<span class="property">classList</span>.<span class="title function_">toggle</span>(<span class="string">&#x27;icon-queren2&#x27;</span>)</span><br><span class="line">  &#125;)</span><br><span class="line">  <span class="comment">// 8. 提交按钮模块</span></span><br><span class="line">    <span class="keyword">let</span> form = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;form&#x27;</span>)</span><br><span class="line">    form.<span class="title function_">addEventListener</span>(<span class="string">&#x27;submit&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">        <span class="comment">// *如果 返回的false就不执行了 所以使用 !false就是 true</span></span><br><span class="line">        <span class="keyword">if</span> (!<span class="title function_">verify</span>()) &#123;</span><br><span class="line">          <span class="comment">// *preventDefault 阻止默认行为</span></span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">if</span> (!<span class="title function_">verifyphone</span>()) &#123;</span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">if</span> (!<span class="title function_">verifycode</span>()) &#123;</span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">if</span> (!<span class="title function_">verifypassword</span>()) &#123;</span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">if</span> (!<span class="title function_">verifypass</span>()) &#123;</span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">  <span class="comment">// 9. 勾选模块</span></span><br><span class="line">        <span class="comment">// *contains 看有没有包含类 有就true 没有就false</span></span><br><span class="line">        <span class="keyword">if</span> (!btnIocn.<span class="property">classList</span>.<span class="title function_">contains</span>(<span class="string">&#x27;icon-queren2&#x27;</span>)) &#123;</span><br><span class="line">            <span class="title function_">alert</span>(<span class="string">&#x27;请勾选同意协议&#x27;</span>)</span><br><span class="line">          e.<span class="title function_">preventDefault</span>()</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;)</span><br><span class="line">  &#125;())</span><br></pre></td></tr></table></figure><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 登录复选框按钮 为false弹窗提示框 </span></span><br><span class="line"><span class="keyword">let</span> btn = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.dl&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> check = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.remember&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> username = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=username]&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> password = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;[name=password]&#x27;</span>)</span><br><span class="line">btn.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="keyword">function</span> (<span class="params">e</span>) &#123;</span><br><span class="line">  <span class="comment">// *阻止默认行为</span></span><br><span class="line">  e.<span class="title function_">preventDefault</span>()</span><br><span class="line">  <span class="keyword">if</span> (!check.<span class="property">checked</span>) &#123;</span><br><span class="line">    <span class="title function_">alert</span>(<span class="string">&#x27;请勾选协议&#x27;</span>)</span><br><span class="line">    <span class="keyword">return</span></span><br><span class="line">  &#125;</span><br><span class="line"><span class="comment">// 2. 为true则记住用户名密码 存储到本地</span></span><br><span class="line">  <span class="keyword">let</span> obj = &#123;</span><br><span class="line">    <span class="attr">username</span>: username.<span class="property">value</span>,</span><br><span class="line">    <span class="attr">password</span>: password.<span class="property">value</span></span><br><span class="line">  &#125;</span><br><span class="line">  <span class="variable language_">localStorage</span>.<span class="title function_">setItem</span>(<span class="string">&#x27;name&#x27;</span>, <span class="title class_">JSON</span>.<span class="title function_">stringify</span>(obj))</span><br><span class="line">  <span class="comment">// *跳转到主页</span></span><br><span class="line">  location.<span class="property">href</span> = <span class="string">&#x27;./index.html&#x27;</span></span><br><span class="line">&#125;)</span><br><span class="line"><span class="comment">// 3. 为true则记住用户名密码 存储到本地</span></span><br><span class="line"><span class="keyword">let</span> obj = <span class="title class_">JSON</span>.<span class="title function_">parse</span>(<span class="variable language_">localStorage</span>.<span class="title function_">getItem</span>(<span class="string">&#x27;name&#x27;</span>))</span><br><span class="line"><span class="keyword">if</span> (obj) &#123;</span><br><span class="line">  username.<span class="property">value</span> = obj.<span class="property">username</span></span><br><span class="line">  password.<span class="property">value</span> = obj.<span class="property">password</span></span><br><span class="line">  check.<span class="property">checked</span> = <span class="literal">true</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1. 如果本地存储有数据 则显示 你好xxx</span></span><br><span class="line"><span class="comment">// 否则 则显示 请先注册登录</span></span><br><span class="line"><span class="keyword">let</span> li = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;.xtx_navs li:first-child a&#x27;</span>)</span><br><span class="line"><span class="keyword">let</span> obj = <span class="title class_">JSON</span>.<span class="title function_">parse</span>(<span class="variable language_">localStorage</span>.<span class="title function_">getItem</span>(<span class="string">&#x27;name&#x27;</span>))</span><br><span class="line"><span class="keyword">if</span> (obj) &#123;</span><br><span class="line">  li.<span class="property">innerHTML</span> = <span class="string">`你好 <span class="subst">$&#123;obj.username&#125;</span>, 欢迎来到小兔鲜儿购物`</span></span><br><span class="line">&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">  li.<span class="property">innerHTML</span> = <span class="string">&#x27;请先注册登录&#x27;</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><hr><h4 id="本节单词"><a href="#本节单词" class="headerlink" title="本节单词:"></a>本节单词:</h4><ol><li>reg</li><li>test</li><li>exec</li><li>replace</li><li>change</li></ol></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org">XC's Blog</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">本文链接:</span> <span class="post-copyright-info"><a href="https://webxc.eu.org/post/ar34/">https://webxc.eu.org/post/ar34/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明:</span> <span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://webxc.eu.org" target="_blank">XC's Blog</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/Web-APIs%E7%AC%94%E8%AE%B0/">Web APIs笔记</a></div><div 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class="comment-head"><div class="comment-headline"><i class="fas fa-comments fa-fw"></i> <span>评论</span></div></div><div class="comment-wrap"><div><div id="twikoo-wrap"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="https://npm.elemecdn.com/webxc@1.0.0/logo/logo.jpg" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="avatar"></div><div class="author-info__name">XC's Blog</div><div class="author-info__description">XC's Blog 记录生活和学习文章</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">95</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">25</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">25</div></a></div><div class="card-info-social-icons is-center"><a class="social-icon" href="https://tenapi.cn/qqzlk/?qq=2848141597" target="_blank" title="QQ"><i class="iconfont icon-QQ"></i></a><a class="social-icon" href="https://npm.elemecdn.com/webxc@1.0.0/lxfs/wechat.jpg" target="_blank" title="微信"><i class="iconfont icon-weixin"></i></a><a class="social-icon" href="https://github.com/web-xc" target="_blank" title="Github"><i class="iconfont icon-github"></i></a><a class="social-icon" href="https://space.bilibili.com/2134826455" target="_blank" title="BiliBili"><i class="iconfont icon-bilibili"></i></a><a class="social-icon" href="https://music.163.com/#/user/home?id=323682437" target="_blank" title="网易云音乐"><i class="iconfont icon-wyy"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">原网站因使用.ml域名被回收, 再加上本人因学习原因, 没怎么打理博客, 使用了https://webxc.eu.org域名来维持博客运行, 如果有加友联的朋友们, 去友联页看信息即可, 如果原来有加过的, 麻烦在原来域名后缀改一下(.ml ==> .eu.org)就行, 博客写的太乱了, 没时间打理, 兄弟们谅解😁😁~~</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#Web-APIs%E7%AC%AC%E4%B8%83%E5%A4%A9-%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F"><span class="toc-number">1.</span> <span class="toc-text">Web APIs第七天-正则表达式</span></a></li></ol><li class="toc-item toc-level-2"><a class="toc-link" href="#1-%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F"><span class="toc-number"></span> <span class="toc-text">1. 正则表达式</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-%E5%AE%9A%E4%B9%89%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E8%AF%AD%E6%B3%95"><span class="toc-number"></span> <span class="toc-text">2. 定义正则表达式语法:</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#3-%E5%88%A4%E6%96%AD%E6%98%AF%E5%90%A6%E6%9C%89%E7%AC%A6%E5%90%88%E8%A7%84%E5%88%99%E7%9A%84%E5%AD%97%E7%AC%A6%E4%B8%B2"><span class="toc-number"></span> <span class="toc-text">3. 判断是否有符合规则的字符串</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-test-%E6%96%B9%E6%B3%95-%E7%94%A8%E6%9D%A5%E6%9F%A5%E7%9C%8B%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E4%B8%8E%E6%8C%87%E5%AE%9A%E7%9A%84%E5%AD%97%E7%AC%A6%E4%B8%B2%E6%98%AF%E5%90%A6%E5%8C%B9%E9%85%8D"><span class="toc-number">1.</span> <span class="toc-text">1. test() 方法 用来查看正则表达式与指定的字符串是否匹配</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E6%A3%80%E7%B4%A2%EF%BC%88%E6%9F%A5%E6%89%BE%EF%BC%89%E7%AC%A6%E5%90%88%E8%A7%84%E5%88%99%E7%9A%84%E5%AD%97%E7%AC%A6%E4%B8%B2%EF%BC%9A"><span class="toc-number">2.</span> <span class="toc-text">2. 检索（查找）符合规则的字符串：</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#4-%E5%85%83%E5%AD%97%E7%AC%A6"><span class="toc-number"></span> <span class="toc-text">4. 元字符</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#1-%E8%BE%B9%E7%95%8C%E7%AC%A6"><span class="toc-number">1.</span> <span class="toc-text">1. 边界符</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#2-%E9%87%8F%E8%AF%8D"><span class="toc-number">2.</span> <span class="toc-text">2. 量词</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#3-%E5%AD%97%E7%AC%A6%E7%B1%BB"><span class="toc-number">3.</span> <span class="toc-text">3.字符类</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#4-%E7%94%A8%E6%88%B7%E5%90%8D%E9%AA%8C%E8%AF%81%E6%A1%88%E4%BE%8B"><span class="toc-number">4.</span> <span class="toc-text">4. 用户名验证案例</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#5-%E5%AD%97%E7%AC%A6%E7%B1%BB%E9%A2%84%E5%AE%9A%E7%B1%BB"><span class="toc-number">5.</span> <span class="toc-text">5. 字符类预定类:</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#6-%E4%BF%AE%E9%A5%B0%E7%AC%A6"><span class="toc-number">6.</span> <span class="toc-text">6. 修饰符</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-%E7%BB%BC%E5%90%88%E6%A1%88%E4%BE%8B"><span class="toc-number"></span> <span class="toc-text">5. 综合案例</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%AC%E8%8A%82%E5%8D%95%E8%AF%8D"><span class="toc-number">0.1.</span> <span class="toc-text">本节单词:</span></a></li></ol></li></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/ds2s/" title="整个前端面试题"><img src="https://cdn1.tianli0.top/gh/web-xc/iMG/postss/vue.png" 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